scholarly journals Fast pick up technique for high quality heterostructures of bilayer graphene and hexagonal boron nitride

2014 ◽  
Vol 105 (1) ◽  
pp. 013101 ◽  
Author(s):  
P. J. Zomer ◽  
M. H. D. Guimarães ◽  
J. C. Brant ◽  
N. Tombros ◽  
B. J. van Wees
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Bilayer Graphene ◽  
High Quality

scholarly journals 2D-3D integration of hexagonal boron nitride and a high-κ dielectric for ultrafast graphene-based electro-absorption modulators

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Hitesh Agarwal ◽  
Bernat Terrés ◽  
Lorenzo Orsini ◽  
Alberto Montanaro ◽  
Vito Sorianello ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Hafnium Oxide ◽  
High Speed ◽  
Hexagonal Boron Nitride ◽  
Temperature Stability ◽  
Cost Effective ◽  
Fold Increase ◽  
Building Blocks ◽  
High Quality ◽  
New Device

AbstractElectro-absorption (EA) waveguide-coupled modulators are essential building blocks for on-chip optical communications. Compared to state-of-the-art silicon (Si) devices, graphene-based EA modulators promise smaller footprints, larger temperature stability, cost-effective integration and high speeds. However, combining high speed and large modulation efficiencies in a single graphene-based device has remained elusive so far. In this work, we overcome this fundamental trade-off by demonstrating the 2D-3D dielectric integration in a high-quality encapsulated graphene device. We integrated hafnium oxide (HfO2) and two-dimensional hexagonal boron nitride (hBN) within the insulating section of a double-layer (DL) graphene EA modulator. This combination of materials allows for a high-quality modulator device with high performances: a ~39 GHz bandwidth (BW) with a three-fold increase in modulation efficiency compared to previously reported high-speed modulators. This 2D-3D dielectric integration paves the way to a plethora of electronic and opto-electronic devices with enhanced performance and stability, while expanding the freedom for new device designs.

scholarly journals Facile Synthesis of High-Quality Nano-Size 10B-Enriched Fibers of Hexagonal Boron Nitride

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 222
Author(s):  
Pervaiz Ahmad ◽  
Mayeen Uddin Khandaker ◽  
Fida Rehman ◽  
Nawshad Muhammad ◽  
Mohammad Rashed Iqbal Faruque ◽  
...  
Keyword(s):  
Boron Nitride ◽  
High Intensity ◽  
Hexagonal Boron Nitride ◽  
Internal Space ◽  
Facile Synthesis ◽  
High Quality ◽  
Crystalline Nature ◽  
Nano Size ◽  
Advanced Applications

The interesting properties of hexagonal boron nitride (h-BN) and its potential uses in thermo-structural advanced applications have been limited or restricted by its inherent brittleness, which can easily be eliminated by its fibers (h-BN) in nanoscale dimensions. The current study is based on the synthesis of nanoscale 10B-enriched fibers of h-BN (10BNNFs) from 10B in the precursors instead of B in two-hour annealing at 900 °C and one-hour growth at 1000 °C. All of the 10BNNFs are randomly curved and highly condensed or filled from 10h-BN species with no internal space or crack. XRD peaks reported the 10h-BN phase and highly crystalline nature of the synthesized 10BNNFs. 10h-BN phase and crystalline nature of 10BNNFs are confirmed from high-intensity peaks at 1392 (cm−1) in Raman and FTIR spectroscopes.

scholarly journals Evidence of Orbital Ferromagnetism in Twisted Bilayer Graphene Aligned to Hexagonal Boron Nitride

Nano Letters ◽  
2021 ◽  
Author(s):  
Aaron L. Sharpe ◽  
Eli J. Fox ◽  
Arthur W. Barnard ◽  
Joe Finney ◽  
Kenji Watanabe ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Bilayer Graphene ◽  
Twisted Bilayer Graphene

Generation of High-Density Quantum Emitters in High-Quality, Exfoliated Hexagonal Boron Nitride

2021 ◽  
Vol 13 (39) ◽  
pp. 47283-47292
Author(s):  
Yongliang Chen ◽  
Chi Li ◽  
Simon White ◽  
Milad Nonahal ◽  
Zai-Quan Xu ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
High Density ◽  
High Quality ◽  
Quantum Emitters

Synthesis of centimeter-scale high-quality polycrystalline hexagonal boron nitride films from the Fe flux

Nanoscale ◽  
2021 ◽  
Author(s):  
Yifei Li ◽  
Xin Wen ◽  
Changjie Tan ◽  
Ning Li ◽  
Ruijie Li ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Two Dimensional ◽  
High Quality ◽  
Boron Nitride Films

Owing to its irreplaceable roles in new functional devices, such as universal substrates and excellent layered insulators, high-quality hexagonal BN (hBN) crystals are exceedingly required in the field of two-dimensional...

Bilayer Graphene-Hexagonal Boron Nitride Heterostructure Negative Differential Resistance Interlayer Tunnel FET

2015 ◽  
Vol 36 (4) ◽  
pp. 405-407 ◽  
Author(s):  
Sangwoo Kang ◽  
Babak Fallahazad ◽  
Kayoung Lee ◽  
Hema Movva ◽  
Kyounghwan Kim ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Negative Differential Resistance ◽  
Hexagonal Boron Nitride ◽  
Differential Resistance ◽  
Bilayer Graphene ◽  
Tunnel Fet

Tunable excitons in bilayer graphene

Science ◽  
2017 ◽  
Vol 358 (6365) ◽  
pp. 907-910 ◽  
Author(s):  
Long Ju ◽  
Lei Wang ◽  
Ting Cao ◽  
Takashi Taniguchi ◽  
Kenji Watanabe ◽  
...  
Keyword(s):  
Bound States ◽  
Hexagonal Boron Nitride ◽  
Solid Material ◽  
Bilayer Graphene ◽  
Winding Number ◽  
Narrow Line ◽  
High Quality ◽  
Mid Infrared ◽  
Photocurrent Spectroscopy ◽  
Line Widths

Excitons, the bound states of an electron and a hole in a solid material, play a key role in the optical properties of insulators and semiconductors. Here, we report the observation of excitons in bilayer graphene (BLG) using photocurrent spectroscopy of high-quality BLG encapsulated in hexagonal boron nitride. We observed two prominent excitonic resonances with narrow line widths that are tunable from the mid-infrared to the terahertz range. These excitons obey optical selection rules distinct from those in conventional semiconductors and feature an electron pseudospin winding number of 2. An external magnetic field induces a large splitting of the valley excitons, corresponding to a g-factor of about 20. These findings open up opportunities to explore exciton physics with pseudospin texture in electrically tunable graphene systems​.

scholarly journals Blue-light-emitting color centers in high-quality hexagonal boron nitride

2019 ◽  
Vol 100 (15) ◽  
Author(s):  
Brian Shevitski ◽  
S. Matt Gilbert ◽  
Christopher T. Chen ◽  
Christoph Kastl ◽  
Edward S. Barnard ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Blue Light ◽  
Hexagonal Boron Nitride ◽  
Color Centers ◽  
High Quality ◽  
Light Emitting

Fabrication of folded bilayer-bilayer graphene/hexagonal boron nitride superlattices

2020 ◽  
Vol 13 (3) ◽  
pp. 035003
Author(s):  
Takuya Iwasaki ◽  
Yoshifumi Morita ◽  
Shu Nakaharai ◽  
Yutaka Wakayama ◽  
Eiichiro Watanabe ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Bilayer Graphene ◽  
Nitride Superlattices
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